First I would look at all the hoses for pinhole leaks. The test the water pump by trying to move the radiator fan back and forth(on a longitudinal engine, not transverse). Turn on the engine and see if there is any coolant leaking from the front of the coolant pump. If so, the coolant pump is going bad. Otherwise, can you smell the sweet smell of coolant in the cab? If so, you probably have a leaking heater-core,
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